Tertiary phosphine oxides



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Unite The present invention relates to novel tertiary phosphine oxides. More particularly, the instant discovery concerns monocarbamoyl-substituted tertiary phosphine oxides.

According to the present invention, novel tertiary phosphine oxides of the formula awn ng areas-n ,HUUm

3,llti,3l Patented Dec. 31, 1963 Reaction may be made to take place at superatmospheric, atmospheric, or sub-atmospheric pressure, preferably at atmospheric pressure. The sequence of addition is not critical, and the reaction may be performed under batch, continuous or semi-batch conditions. A wide range of temperatures may be employed, excellent results being achieved at ambient temperature. While temperatures in the range of 30 C. to 110 C. are preferred, temperatures as low as l5 C. and as high as 200 C. may be used.

Typical isocyanate reactants contemplated herein are aryl isocyanates, such as phenyl isocyanate, para-chlorophenyl isocyanate, 2,5-dichlorophenyl isocyanate, paranitrophenyl isocyanate, meta-tolyl isocyanate, orthochlo- O O H rophenyl isocyanate, para-methoxyphenyl isocyanate,

R R {1 It t R meta-mtrophenyl asocyanate, l-naphthyl isocyanate, 2-

t 1 2 naphthyl isocyanate, and the like. It can be seen that which phgsphlne OXldeS Useful as'flame retardants typical inert substituents LfOl' the aryl isocyanates conte-m when pp to 60301.1 cloth, or llke, am prepared plated herein we lower alkyl, nitro, lower alkoxy, halom S Y' f the formula RNCO and Secondary 2O gen (erg. chlorine, bromine, etc.), and the like.

P 9 QXldeS 0f the formula If desired, organic basic catalysts, including penta 0 methylguan-idine, tertiary amines, such as trialkyl (C C amines may be employed to enhance the reaction RiRzPH u contemplated herein. Only small amounts of these cata- R in the above formulae represents aryl, subst tuted and lysts need be employed Le amounts up to about pan unsubstfmtedi R1 R each rePresent subsn'mwd and cent by Weight based on the total weight of the reactants.

unsubstituted, saturatedand unsaturated, branched and As m as 0.05 percent by Weight or less will oftfin be straight chain alkyl having from 1 to 18 carbon atoms, hslpful substituted and unsubstltutefl cycloalkyl as oyclo' The present invention will be illustrated hereinafter by hexyl and cyclopentyl, subsmuted and unsubstltuted aryl, examples which are intended to further describe, not

Such Phenyl and Paphthyllimit, the scope of the invention.

Pursuant to a typical embodiment of the instant invention, the following reaction is made to take place: EXAMPLE I 0 A solution of 5.0 grams (0.029 mole) of bis(2-oyanoll ethyl)phosphine oxide 4 9 grams (0032 mole) of para- H 11 PH 1 N (0N0 m 0 00 chlorophenylisocyanate, and 5 drops of triethylamme in O O H milliliters of chloroform is refluxed for 30 minutes. CNOH CH) ll 0 l, 01 The reaction mixture is cooled and filtered, and the white 2, 2 2- solid is recrystallized from chloroform; 6.0 grams of 40 para chlorophenylcarbamylbis(2 cyanoethyl)phosphine Reaction 1s best carried out in the presence of an inert id hi point 145 C, i bt i d organic solvent, such as an aromatic hydrocarbon, an I I ether, a halogenated hydrocarbon, or the like. Typical EXAMPLES ILVHI inert organic solvents are xylene, benzene, toluene, tetra- The following tabulated examples are carried out essenhydrofuran, dioxane, chlorbenzene, chloroform, and the 4 tially as in Example I, above, the essential reaction conlike. dition tdiiferences being specified in the table:

Table I n l if t R R PH RNCO R1RzPC-N-R Reactants Tem- Product Ratio, pera- Example 7 Catalyst Phosphine: tore, Solvent Phosphine Isocyanate Isocyanate 0. R1 R: R

Oxide II diethylphospara-chlorotributyl- 1:1 30 xylene ethyl ethyl para-chlorophine oxide. phenytl isoamine. phenyl.

cyana (3.

III dioctylphos- 2,5-dichlorotrimethyl- 1:2 40 tetrahydrofuran octyl octyl 2,5-dichlorophine oxide. phenyl isoamine. phony].

cyanate.

IV didodecylpara-nitrotributyl- 1.5:1 dioxano dodecyl dodecy1 para-nitrophosphine phenyl isoamine. phenyl. oxide. cyan'ate.

V diisopropylmeta-tolyl tripropyl- 1:1 toluene isopr0pyl isopropyl meta-tolyl.

pholsphine isocyanate. amine.

VI dicyclohexylpara-mcthtriethyl- 1:4 50 dimethylformamideu eyclohcxylh cyclohexyL. para-methphosphine oxyphcnyl amine. oxyphenyl oxide. isocyanate.

VII dieyclopentyll-naphthyh' pentamethyl- 2:1 22 chloroform cyclopentyl. cyclopcntyl. 1naphthyl.

' phoisphine isocyanate. guanidine.

VIII diociadecylpara-bromodo 1:2 25 perchloroethanc octadccyl octadeeyl para-bromophosphine phenyl isophenyl. oxide. cyanate.

3 EXAMPLES X-XXHI I claim: The'following tabulated reactions are carried out essen- A ternary phosphmeoxldc of formula tially as in Example 1, above, the essential differences in T rection conditions being specified in the table: RiRz1C-NR Table II s (I? lll ii ll IhRzlll RNCO R1 O Reaetants 'lom- Product Ratio, pera- 3 Example 7 Catalyst Phosphine: turo, Solvent Phosphine Isoeyanate Isoeyauate ,3 0. R1 R2 R Oxide t X dimethylphenyliso tributyl- 1;1 50 benzene metl1yl methyl phenyl.

phosphine eyounte. amine. oxide.

XI dioetylphos meto-ehloro- 1;2 60 (liQtdlyl-Clllcl oetyi octyl metaphine phonyl iso- N 0111011?" oxide. eyanate. P yl- JXII didodecylparamethyL triethyl- 3:1 *100 toluene ddeeyl. dodecyLun parapliosphine phenyl isoamine. methylox' e. eyanote. P y

XIII diisobutyl- {)zua-[luorotripropyl 1:1 chloroform 1sobutyl isobutylflfl; paraphosphine phony} 1 amino, i fluorooxitlo. V eyanste, phenyl.

XIV tliethylphosmet illn tribntyb 1:1 CH3OCH2CH2OCH3 ethyl etnyl JllOldUiliphine or nethyl) amine, fluorooxide. isoeyiumte. Q Y

]) icny XV bis(trilluoro Q-Imphthyl H 1;3 benzene trilluorotriiluoro- Z-Imphthyl.

methyl)- i y nm methyl. methyl. phosphine 7 oxide.

XVI dinhenylphos lliclfl-broniotric-thyi- 2;1 82 Nude phony] pllenyl metaphine phenyl 1 mnine. bronmoxide. cyanaw phony].

XVII... dibenzylphosplieny1 11 85 do -Jbenzyl be11zyl...-. phony]. Dh w isoeyanate. 7

Oxide. s

XVIII bis(2-butoxypflln-lnothyltributyl- 1 5;2 toluene 2-but-0xy- 2-butoxypometl1y1)phosphenylisoamine ethyl, ethyl. 7 methylphine 'cygmatel phony], oxide.

XIX 1 bis(para phenyl-isotripropyl- 1;1 65 chloroform pm-echloroparacllloroe D0.

ehlorooyanntc, 7 amino. phony]. p yl. plienyD- W phosphinc W oxide.

XX bistpzu'ado triethyl- 1:1 80 benzene parnmctliylpar-'miethyl- Do.

IIIOUIYI- amine. phenyl. phenyl. phonyD- phosphine oxide. n

XXI divinyl- 1 H 1;1 03 r do vinyl vinyl .1 Do.

phosphine oxide.

XXII. 2-eyanoethyldo triethyl- 1:2 79 d0 Q-eyano- 1-0ctcnyl. D0.

(l-oetenyD- amine. ethyl. phosphine oxide. 7 i

XXIII buty1(l-dodedo tributyr 1:15 ..-do -i butyl l-dodeeenyl Do. ceuyDphosamine. W eenyl pnme oxide.

It follows from the above representative examples that '7 typical substituents for the secondary phosphine oxide reactants are lower alkyl, phenyl; halogen. lower alkoXy, cyano, and the like. characteristically, these and like wherein R is a member selected from the group consisting of phenyl, naphthyh'and substituted phenyl, said substituents for phenyl being selected from the group 'consisting of lower alkyl, nitro, lower alkoxy and halogen;

55 7. 7 substituents are inert under the reactions contemplated R1 and f i represent: a l sclected from thfi herein group consisting of alkyl having from 1 to 18 carbon The products of the present invention are useful as atpms alkenyl haymg. from 1 to 18 Carbon atoms subt stituted alkyl having rrom 1 to 18 carbon atoms, eyclo- 1e letardant s for cotton cloth, as indicated heremabove. '1 I m u 1 th d a 0 t n 60 hexyl, cyciopentyl, phenyl, substituted phenyl, naphthyl 1' CO u E 0 We and substituted naphthyl, said substitnents for alkyl being known pwcgdurest ta b.e eoi-ut-ron oriany 0116 Q selected from the group consisting of halogen, phenyl, these monocarbamyl-subst1tuted tertiary phosphines manilower alkoxy and cyano, and Said substituems f phenyl fests desirable fire retardance. and naphthyl being selected from the group consisting of Clearly, the instant discovery encompasses numerous 11 lk l h m lower anwxy d rcyano' modifications within ,the skill of the art. Consequently, 2; Para-chlorophenylcarbamylbis(2 cyanoethyl)-phoswhlle the present invention has been described in detail phine oxide. V with respect to specific embodiments thereof, it is not 3. Dibutyl(l-naphthylcarbamoyl)phosphine oxide. intended that these details be construed as limitations References Cited in the file of this patent upon the scope of the'n'nvention, except insofar as they V UNITED STATES PATENTS appear in the appended claims.

2,971,019 Ladd et a1, w, Feb. 7, 1961 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 3 116 315 December 31 1963 Michael M. Rauhut It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Columns 3 and 4, Table II Example XIX under the heading "R" for "D0" read phenyl same table Example XXIII under the heading "R for "l-dodecenyl cenyl read l-dodecenyl Signed and sealed this 30th day of June 1964.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer Commissioner of Patents 

1. A TERTIARY PHOSPHINE OXIDE OF THE FORMULA 